VR HMD eye box and sweet spot

"sweet spot" is central Field of View region with good resolution and minimal artifacts
"eye box" is 3D space in which eye pupil can enjoy "sweet spot".

images snagged from Artur's "State of VR Optics in 2023" video

Eyebox: 3D tolerances for pupil location

Sweet spot: ideally, field-of-view for resolution limited by pixel size

Pancake lens - expanded view

maintained by blekenbleu